42 Draconis b. See also[edit] References[edit] 47 Ursae Majoris c. 47 Ursae Majoris c (sometimes abbreviated 47 Uma c) is an extrasolar planet approximately 46 light-years from Earth in the constellation of Ursa Major. The planet was discovered located in a long-period around the star 47 Ursae Majoris. Its orbit lasts 6.55 years and the planet has a mass at least 0.540 times that of Jupiter. Discovery[edit] Orbits of the 47 Ursae Majoris system planets. 47 UMa c is the middle planet. Like the majority of known extrasolar planets, 47 Ursae Majoris c was discovered by detecting changes in its star's radial velocity caused by the planet's gravity.
At the time of discovery in 2001, 47 Ursae Majoris was already known to host one extrasolar planet, designated 47 Ursae Majoris b. Further measurements of 47 Ursae Majoris failed to detect the planet, calling its existence into question. Physical characteristics[edit] Since 47 Ursae Majoris c was detected indirectly, properties such as its radius, composition, and temperature are unknown.
See also[edit] [edit] Gliese 176 b. The initial announcement confused the planetary periodicity with the stellar periodicity of 40 days, thus giving a 10.24 day period for a 25 Earth-mass planet.[2] Subsequent readings filtered out the star's rotation, giving a more accurate reading of the planet's orbit and minimum mass.
The planet orbits inside the inner magnetosphere of its star. The quoted temperature of 450 K is a "thermal equilibrium" temperature.[1] It is projected to be dominated by a rocky core, but the true mass is unknown. If the orbit is orientated such that we are viewing it at a nearly face-on angle, the planet may be significantly more massive than the lower limit. References[edit] External links[edit] "Notes for planet HD 285968 b". Coordinates: PSR B1257+12 C. Name[edit] Artist’s impression of PSR B1257+12 d. The planets of PSR B1257+12 are designated from A to D (ordered by increasing distance).
The reason that these planets are not named the same as the other extrasolar planets is mainly because of the time of their discovery. Being the first ever extrasolar planets discovered, and being discovered around a pulsar, the planets were given the uppercase letters "B" and "C" (like other planets). When a third planet was discovered around the system (in a closer orbit then the other two), the name "A" was commonly used. The name 51 Pegasi b (the first planet found around a Sun-like star) was the idea used for naming planets around regular stars. Notes[edit] Jump up ^ The method used to determine the inclination includes a degeneracy because of the impossibility of determining whether the orbital motion is clockwise or anticlockwise. References[edit] External links[edit] Media related to PSR B1257+12 C at Wikimedia Commons Coordinates:
Kepler-11d. Name and discovery[edit] Host star[edit] At a distance of 613 parsecs, Kepler-11d has an apparent magnitude of 14.2. It is, thus, not visible with the naked eye.[1] Characteristics[edit] A comparison of the Kepler planets as compared to Earth, Jupiter, and previous Kepler finds. The presence of large quantities of hydrogen and helium on Kepler-11d, Kepler-11e, and Kepler-11f suggest that these planets formed within the first few million years of the system's existence, when gas could still be captured from the forming protoplanetary disc.[3] References[edit] Gliese 777 b. The signal produced by the planet is very weak and the eccentricity was originally supposed to be very circular which led to speculations of a very Jupiter-like planet, with a system of several large moons like Jupiter itself.
Fortunately, the inner system should be stable for Earth-like planets despite a known, smaller inner Neptune-like planet which is known to orbit the star at distance of 0.12 AU every 17 Earth days. References[edit] External links[edit] Coordinates: HD 11964 b. HD 11964 b is an extrasolar planet, a gas giant like Jupiter approximately 107 light-years away in the constellation of Cetus. The planet orbits the yellow subgiant star HD 11964 in a nearly-circular orbit, taking over 5 years to complete a revolution around the star at a distance of 3.34 astronomical units.[1] The planet was discovered in 2005 and published as part of the Catalog of Nearby Exoplanets under the designation HD 11964 b.[2] However since that time there has been confusion as to the designations of the planets in the HD 11964 system, leading to some sources designating this planet as "HD 11964 c".[3][4] In a recent review of the properties of multi-planet extrasolar planetary systems, the discovery team has stated that the correct designation for this planet is HD 11964 b.[1] Coordinates:
HD 290327 b. Coordinates: